Dakota and Elle Fanning

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The polished duo make for a perfect best friend (or sister!) costume. If you're Dakota, don a trendy look, and if you're Elle, try an even trendier one. Might we suggest some imitation Rodarte? Blonde wigs are a must, as is a bare-faced beauty look. And if you're really going method with the stylish siblings, carry around a stack of fashion show invites with you all night.